Metering pump



c. R. ALDEN UTERING PUMP sept.- 1, 193s.

Filed Dc. 23, 19:52

4 Sheets-Sheet 3 Jim/4 N .v e www .Sept 1, 1936.

c. R. ALDI-:N

METERING PUMP Fild" neej.A 25, 1952 4 sheets-sheet 4 dilaga/6v Y `Patented Sept. 1,1936` y Maresme ruin.

camu n. Alden, verwennen.. amr i sx- Cell-O Aircraft Tool Corporation, Detroit, j Mich.. a corporation o! Michigan sppuwion December z3, 16:2. saw Ns. am

4s calmi. lol. 12s-m) The presentinvention relates to improvements in metering pumps adapted particularly for supplying fuel under pressure to internal combustion engines.

One of the objects of the invention resides in the provision in a pump, having a plurality of cylinder and piston units with individual discharge lines, and having means for operating the A units in timed sequence, of means including a novel rotary valve member for controlling the delivery oi fluid from the cylinders in timed metered quantities to their respective discharge lines.

Further objects are to provide. in a pump oi the foregoing character, a valve member which is ad- Justable to vary the duration and hence the volume of uid delivery. and which preferably'is also adjustable to vary the phase relation in each cylinder of the period of iluid delivery to the pressure period.

Still other objects of the invention reside in the provision, in a cylinder and piston pump. ot a novel rotary valve member for delivering a metered quantity of iluid displaced from the cylinder over a predetermined intermediate period during each pressure stroke of the piston. the

' valve member being axially adjustable to vary the duration of the period of uid delivery, and being angularly adjustable to vary the phase relation of the delivery period to the pressure stroke.

Another object .is to provide a novel cylinder and piston pump, adapted to deliver a metered quantity oi iiuid during each pressure stroke of the piston, in which each iiuid discharge is im-A n iediately preceded by the storage of trapped pressure energy in the cylinder and is initiated with a pressure wave or impulse resulting from the sudden release of the stored energy.

' A further object is to provide 'a new and i111-,v proved cylinder and piston pump, adapted to deliver a metered quantity of iluid over a predetermined period'durin'g each pressure stroke of the piston, in which the phase relation of the period of uld delivery to the pressure stroke is subject to adjustment automatically in response .to changes in the speed ci' operation. i

Another object resides in the provision of a multiple cylinder and piston pump having a graduated rate of iiuid delivery, and more particularly having a plurality of discharge lines one for each cylindenand valve means forl delivering metered quantities of duid from the cylinders in timed sequence respectively to the discharge lines, a number of the cylinders' being connected successively and in overlapping relation to eachl discharge line v'during the period of uid delivery thereto.

` A general object is to provide a novel pump y which is simple and inexpensive in construction,

and vwhich. with the. aid oi' minor structural changes can be easily andadvantageously adapted to accomplish a wide' range of functions. y

Further objects and advantages will become apparent as the description proceeds.

In the accompanying drawings, Figure 1 is a Aplan view oi' 'one form 'of pump embodying the features of my invention.

`ll'ig. z is a longitudinal vertical sectionalview taken. substantially along line 2-2 of Fig. l.

Fis. 3 is a transverse vertical sectional view taken substantially along line 3--3 of Fig. 2.

Fis. 4 is a transverse vertical sectional view taken substantially along line t-I of Fig. 2.

Fig. 5 is a transverse sectional view taken substantially along line 5-'4 of Fig. 2.

v Fig. 8 is a plan view oi' a modiiled iorm of the Fig. 10 isa diagrammatic view illustrating the rotor of the modiiled form in plan development with the associated ports superimposed in dotted outline.

Fig. l11 is a view similar to Fig. l0 of another modiiled form ot the invention.

Fig. 12 is a fragmentary view partially in section along line II-ll of Fig. 13 of still another modiiied form of the invention.

Figs. 13, 14 and l5 are transverse sectional views taken 'substantially along lines ll-il, It-it and il-it of 1113.12.

Fig. 18 is a diagrammatic view illustrating the rotor of the form shown in Figs. 12 to 15. in plan development with the associated ports superimposed in dotted outline.

While the invention is susceptible of various modiilcations and alternative constructions. I have shown in the drawings and will herein describe in detail the preferred embodiment, but

itis to be understood that I do not thereby intend to linut the invention to the speelde form disclosed, but intend to cover all modifications and Halternative constructions falling within the spirit the pump in the form illustrated in Figs. 1 tos interntting with a peripheral groove 2l in the other. The end sections 2li and 22 are formed ex-4 ternally with peripherally spaced lugs 2| aligned in pairs and connected by tie rods 21 to secure all of the sections in assembled relation.` One of the end sections, namely the section 2l, is adapted to beA mounted on a suitable support, and to this end is provided with a peripheral mounting flange 28 herein shown as secured to a wall 2l about an opening 30. The wall 2l may constitute part of an engine crank shaft case where the pump is utilized as part of the fuel injection More specifically, the two intermediate sections 2| and 22 constitute the pump body, the end section 20 constitutes a gear housing, and the other end section 22 constitutes a-drive housing. y

The body section 2| is formed with an axial bore Il and with a plurality of longitudinal bores,

' let ports 321 to l1" in the same plane as the inlet ports and opening cutwardlythrough the body section 2| for connection respectively to uid .discharge conduits 39 to Il. Preferably, the inlet and outlet ports for. each cylinder are diametri cally opposed and in radial alignment. Spring seated non-return valves "to Eil are interposed respectively between the outlet ports 3 2 to I1. and the discharge conduits 29 to u.

To afford means for attaching the conduits 29 'to u and the valves u to u, the body section :l

is formed externally with a peripheral enlargement 5I. The tie 'rods 21 extend through the enlargement Il to increase the rigidity of theV pump casing assembly. Opening radially inwardly from the periphery of the enlargement Si, and

communicating axially respectively with the outer l ripheral ange l2 at its inner end and a conical valve seat Il in its outer and. A valve casing ll having a chamber Si is threaded into the bore about the sleeve l2 and against the ilangelI.

, The` chamber I8 opens to the outer end ofthe casing Il through a restricted port I1.r A conical Avalve member Il, having a Viluted stem Il llidable in the sleeve I2. is movable in the cham-v ber Il, and is normally held against the seat M by a coiled compression spring It. The inlet end of one' of the conduits 2l to Il is connected by meanaof a gland nut 8| to the outer end of the calins llin communication with the port I1.

Sure.

Opening through the body section 2| to the bore 3| in a plane closely adjacent that of the inlet ports 32"I to 31' is an inlet 'passage l2. A supply conduit 63, adapted to be connected to a suitable source (not shown), is connectedby 5 means of a nut. to the enlarged outer end of the passage 62. j

A plurality of pump pistons 65 to 10 are mounted for reciprocation respectively in the pump cylinders 32 to 31, and project therefrom l0 into a chamber 1| formed in the aiacent 'end of the bodyvsectlon 22. Preferably, the pistons 65 to 10 are cylindrical in form throughout their length, and are urged outwardly by spring presof each piston is formed with a peripheral groove 12, semi-circular in cross-section, in which a split wire ring 18 is snugly disposed. Mounted on each piston is an annular retainer 14 which In the present instance, vthe outer end 15 has an inner peripheral flange 15 at one end 20 iltting over the wire ring13 snugly against the piston, and which has an outer peripheral ange 16 at the other end. The retainer 14 when in. position prevents removal of the ring 13 from the grooveA 12. A coiled compression spring 11 .25

is disposed in theeehanber 1| and in spaced relation about each piston and its retainer 1l, with its ends abutting respectively against the body portion 2| and the flange 1G.

Respectively abutting against theouter ends of the pistons 65 to 1li, within the spring retainers 14, and axially aligned therewith are a plurality of operating plungers 18 to l2. These plungers extend reciprocably through a plurality of parallel uniformly circularly spaced bores Il to 89, formed in the body section 22 and in substantial axialalignment with the pump cylinders 32 to 31, into a chamber 90 in the housing4 section 23. It will be evident that the plungers 18 to 83 in eiect constitute continuations 'of the pistons B5 to 10, but by reason of their seperation from the pistons require less accuracy in construction than do the latter for emcicnt operation. To provide means for riving the pistons B5 to 10 in uniformly timed vsequence and preferably harmonically, the outer ends of the plungers 18 to B3 in the chamber Sil are each provided with a headili having a conical bear-- ing surface 82 adapted for engagement with a wobble member 93. Preferably, the wobble mem- 50 ber 93 is in the form of an inclined circular disk which has a ilat bearing surface 9i on one side against which the heads 8| are -urged by the springs 11, and which .has a parallel bearing surface 8l on the other side in free oating engagement with aiiat inclined end surface DI of a rotary drive disk 91. The drive disk I1 bears against the end wall of the housing section t 22, and has an axial sleeve 98 rotatably journaled in a bearing I9 on the wall. Suitable ducts lll are formed inthe housing section 22 for supplying a lubricant to the bearing surfaces. Extending axially through the sleeve Q8, the disk l1 and an opening |0| in the disk 93 into the' chamber l0, and keyed to the sleeve for rotation therewith is a drive shaft |02. The surface of the opening ||i| is curved so as to t the shaft |22 in any angular positionkof the disk Il, thus locating the latter definitely` in position on the drive disk 91. Theinner end of the shaft |02 is rotatably' supported in an axial bore il# formed a in -the adjacent end of the body section 22. y The outer end of the shaft |22 is adapted -to be connected. as through a gear IM. to a source-of power, such for example'as the crank shaft ot 75- the. pistons 65 to 'l0 will be reciprocated harmonically in 'uniformly timed sequence.

A'valve member |05 for controlling the pas,- sage of uidv through the inlet ports 32in to 31'L is mounted in the central bore 3| for rotation in timed relation to the operation of the pistons 65 vto 10. Preferably, the valvemember |05 is in the form of a cylindrical rotor having a. close fit in the bore 3|. It will be evident that the pump body sections 2| and 22 constitute a, valve casing for the rotor. y y

The'valverotor |05 may be driven by any suitable means, and is herein shown asV connected to the drive shaft |02. Thus, one end-A of the valve |05 extends into ther chamber 1|, and is formed therein with an axial bore |06 and with :two longitudinal diametrically opposed slots |01 opening to the bore. A connecting shaft |08, extending slidably and rotatably through a central bore |00 meeting the bore |03 in the body, sec'- tion22, extends at one end into the bbre |06 and carries a diametrical pin ||0 slidably keyed at opposite ends in the slots |01. The other end of the shaft |00 extends into an axial bore ||v in the inner end 0i' the drive shaft |02, and is keyed therein by means of a pin 2 extending in a. longitudinally inclinedor helical slot ||3 formedin the side oi the shaft |02.

The valve rotor |05 isformed with ,a peripheral groove ||4 in constant communication with the inlet passage 62 and projecting through the planel of the inlet po'rts 32B to 31H. The groove ||4 together with the surface of the bore 3| serves to define a low'pressure fluid inlet area for supplyin'g iiuidto the pump cylinders '32 to 31. Projectinginto oneside of the area III through the plane of the inlet vports 32n to 31, and adaptedv the associated pump piston. Preferablmthis period is timed to occurv at or hear the middle of the pressure stroke when by reason of the simple vharmonic drive the rate of flow is the greatest.Y

It will be evident that during the suction stroke of each piston, fluid from the fluid area III vwill pass freely through the associated inlet port into the pump cylinder, and that during the pressure stroke the fluid will be returned to the fluid area ||4 excepting' when the inlet port is closed by the land area H5, during which period the trapped fluid 'will be forced under pressure and *in a metered quantity through the outlet port and the non-return valve tothe discharge conduit, associated therewith.

By reason of the inclination of the slot i3, the phase relation of the rotor |05 to the operation of the pistons to 10 may be varied by shifting the intermediate shaft |08 axially, thereby shifting the period of fluid delivery or injection relative to the degree vof engine crank shaft rotation..v Thus, the shaft |08 is formed with a longitudinal :gear rack liwhich meshes with a pinion ||1 on ing control means (not shown).

32n to 31B, which serve as'inlet ports when un- To provide means for adjusting the metered quantity of each fluid charge deliveredby vthe pump, the land are'a 5 is tapered in width. Hence, axial adjustment of the rotor |05 will cause the duration of the period during which 5 each inlet port is. cut olf or closed from the inlet fluid area I4 to be varied .in accordance with the width of the land area ll5. Within the broad concept of the invention, the Width 'of the land area 5 may be varied in any manner, namely l0 in either direction, uniformly or irregularly, symmetrically or unsymmetrically, etc. Preferably, however, the land area ||5.tapers uniformly toward its free end, with the leading edge H5 parallel tov the axis of rotation and the trailing l5 edge ||5b inclined theretofso that the start of discharge or injection is lfixed and the cut-off thereof is variable. Reversing the rotation of the rotor |05 would result in a reversal of the leading and trailing edges of the land area ||5.

To provide means for adjusting the rotor |05 axially, it is provided onone end with a. longitudinal gear rack |2| which meshes with a pinion |22 in the housing section 20. The pinion |22 is `fixed on the inner end of a vertical shaft |23 25v which extends from the section 20 through a bearing |24, and to the outer end of which a levez` |25 is secured for connection to a suitable meter- The uid area I4 is of such width that it will be capable of communication with the inlet passage 62 and the inlet ports 32B to 31l in all axial positions of the rotor |05. f t Thus, the rotor |05 has both timing and meter-.- ing functions, and more specifically is adjustable 35 to vary independently the timed occurrence and thequantity or period of duration of each pump discharge. While the pump is not limited'to lany one purpose, itis particularly adapted, by reason y of the foregoing functions, for use as a fuel meter- 40 ing pump in the injection system of an internal combustion engine. When the pump is so employed, the discharge conduits 33 to 44 may be connected respectively to the engine cylinders (not shown) or to the air intake manifold therefor (not shown), and may be provided at their discharge ends with suitable spring seated injectionvnozzle valves (not shown). Assuming forv purposes of illustration that the pump is to be used to deliver fuel in timed meteredsequential charges to the cylinders of an internal combustion engine, the duration oi' each pump discharge will be coincident with each period of fuel injection, and hence the two expressions are used synonymously herein.

The pump cylinders 32 to 31. instead of being connected to the discharge conduits Slto M diy'rectly through the outletports 32h to 31h, may be connected thereto-in timed sequence, during their respective pressure periods, by distributor means as embodied in the modified form of inventionv illustrated in Figs. 6 to l0. As a result, the individual check valves 45 to 50 need not be provided. The two forms of the invention are substantially alike in all other respects, and hence corresponding parts thereof will be identified by' the same reference characters.

The distributor means preferably is embodied. in the valve rotor |05, and utilizes the ports covered by the land area H5, as delivery ports.

To this end, a recess in the form of an elongated slot |26 is formed within the land area ||5 for movement successively across and hence into communication with the ports 32 to 31 upon 75 rotation of the rotor |05. The recess |20 has a leading edge |26 and a trailing edge |25", and

-inlet and delivery ports 32* to 31 are a plurality of uniformly peripherally spaced discharge ports |21 to |32. The inlet ends of the discharge conduits 33 to 44 are connected to the body section 2| in communication respectively with the discharge ports |21 to |32 by means of gland nuts |33. Anvelongated recess or slot |34 is'formed in the periphery of the rotor |05 for movement successively across the ports |21 to |32, and is connected through a series of inter-communicating passages |35, |35 and |31 formed in the body of the rotorto therecess |25. The recess |34 has a leading edge |34* and a trailing edge |342' and extends generally longitudinally of the rotor |05.

j The recesses |25 and |34 are so related in angular phase to each other and to the respective sets of ports with which they are associated that during communication of the recess |26 with any one ofthe outlet ports 32n to 31e, the recess |34 is adapted to communicate for a given period with the associated one of the discharge ports |21 to |32, thereby connecting the associated pump cylinder .and discharge conduit for the pressure injection of the fluid displaced by the associated plunger during said period.

It will be evident that upon moving either orboth of the recesses |26 and |34 out of communication with the associated ports, communication of the discharge conduits 39 to 44 with the low pressure iuid area I |4 will be interrupted at the surface of the bore 3|, thus preventing any substantial return flow of the pressure fiuid trapped therein. However, to insure the prevention of return flow under all operating conditions, a non-return vvalve |38 may be interposed between the recesses |25 and |34. In the present instance, the intermediate passage |35 extends axially through the rotor |05, and is formed mtween the passages |35 and |31 with an annular valve seat |39. A valve member |40 having a fluted stem |4| slidable in one end of the pasysage |35 is normally held against the seat |33 by a ycoiled compression spring |42. Suitable screw plugs |43 serve to close the opposite ends of the e |35.

4The specic form of the rotor |05, and more particularly the shape of and relationship between the land area H5, the recesses |25 and |34 and the assocated ports, determine certain y grec of 'overlap determines the period of. injec-l tion or pump discharge. VTo prevent the outlet .port by-passing fluid from vthe recess |23 to the low pressureuid area |4, the width of the land area ||5 between the trailing edges ||5b and |25 is sumcient to cover the port `com- ,V pletely. Preferably, the recess |26 is the iirst t o f break communication with its port sothatl 'the''f trailing edge |23h denes the point of cut-ofi'.

The recesses |25 and |34 arev inclined to each other longitudinally of the rotor |05 so that axial adjustment will effect a proportional variation in the aforesaid degree of overlap .and hence in the duration of the period of pump discharge. Preferably, the recess |34, and its longitudinal edges |34* and |34, are parallelto the axis o1" rotation, and the recess `|26 is inclinedand the first to communicate with its port so that of the period of pump discharge, the starting point is fixed and the Ipoint of cut-off is variable for any given adjustment of the rotorv in accordance with the inclination of the trailing edge |25.

The land area ||5 between the leading edge ||5n and the-recess |25 may have any suitable width, but if lessthan or only equal in width to the delivery port, the leading edge H5 must have passed from the port bythe time the recess |34 is moved into communication with the related discharge port so as to prevent theby-passing of fluid from the discharge conduit to the low pressure fluid area |I4. Thus, the leading edge |26* of the recess |25 merely determines the degree of initial opening prior to .the start of the discharge period. A

The rotor |05 is also of such character that each pump discharge or injection is started with a pressure wave or impulse due to stored pressure energy. In the preferred form, the stored pressure venergyis created by cutting od the delivery port from each pump cylinder by the land area Ii5 a short time before the recess |34 is moved into communication with the related discharger port. It will be evident that during the remain-4 ing movement of the rotor before such communication, the pump cylinder will have no outlet, and hence the piston will compress the fluid therein to a point in excess of the normal discharge pres- Y area 5 has ju'st passed over the delivery port 32,

communication of the portl with the recess |26 will have been established. However, connection of the pump cylinder 32 with the discharge conduit 33 will not yet have been completed since the recess |34 is still spaced from the discharge port |21. `During the movement of the rotor through the remaining distance necessary to move the recess m mm communication with the por: |21, the

fluid in the cylinder will be trapped and hence subject to being highly compressed by the pump piston 35. However., upon completing the discharge connection, the stored pressure energy will vinitiate the pump discharge or injection with a surge or impulse which will tend to open the check valve |33 and also any valve (not shown) in the discharge conduit Y35 without delay and which will tend tc take up the natural resiliency inherent in the walls of the conduit so as to insure prompt and accurately metered injection. The

iiuid displaced from the pump cylinder ,is dis= charged to the conduit 3l until the trailing edge |23 leaves the port 32". Immediately thereafter, the port 32* is uncovered by the land 5 and again communicates with thelow pressure fluid` area ll4towhichtheiluiddisplacedbytherecover each delivery port as it passes thereover.

communication with the port 52.

stroke is lay-pissed.

subsequent suction stroke of the pump piston 55- and until during an intermediate portionl of the next pressure stroke of the piston it is again coveredlby the land ||5. y

The foregoing operation is the same for all of the respective pump units. Hence the vdischarge conduits 39 to 44 are supplied in timed sequence with accurately metered iluid charges tion or for any other purpose.

Another modiiled form closely similar to that of Figs. to 10 is illustrated in Fig. 11. These two forms are alike vstructurally except foi' slight changes in'the rotor- |55, and differ in operating characteristics as a result of the diiferences in rotor structure. Hence, only a plan development of the rotor |05 is illustrated in Fig. 11, and corresponding parts of the two forms aredesignated by like reference characters.

In this second modified form of the invention, the rotor |55 is operable automatically to advance the timing of the pump dischargeas the speed is increased. The recess |54 islocated to communicate with each discharge port before cuto of the related delivery port by the land ||5.` Hence, opening of the recess |25 tothe delivery port determines the start of pump discharge.

Preferably, the leading edge |25 is parallel to the axis of rotation/so that the point of communication with the delivery ports will be constant for all axial positions of the rotor |55. To prevent lay-passing from the recess |25 to the fluid area H4, the width of the land area ||5 between the leading edges H5* and |25l is Just sumcient' to Formed in the leading face of the land area ||5 and preferably extending parallel to the leading edge |25* is a narrow shallow by-pass slot |44 opening to the low pressure .fluid ares. H4, and having leading and trailing 'edges |44'A and 144|.

In operation, assuming the rotor |55 to be turning. in the direction of the arrow and the parts to be in the relative position shown in Fig. 11, the recess |54 is open to the discharge port |21, the delivery port 52l is covered by the land area ||5, and the recess |25 is about to open to the delivery port 52". At this time. the pump piston is moving approximately at its maximum velocity in its pressure stroke.

The port 52, although past -theleading edge;

||5-, is vented to the low pressure area ||4 through the slot |44, and will continue to be so vented until it moves past the trailing edge |44. At relatively slow speeds, the slot .|44 while open, to the port 52' will by-pass substantially all of the iluid displacement ofthe pump piston 55 to the low pressure area 4. Hence, the discharge of i'iuid to the conduit 59 will be delayed until the port 52* passes the trailing edge |44"- of the slot |44. Thereafter, the full displacement of the pistons 55 will be delivered until cut-ot! by the trailing edge |25". As the speed is increased, less fluid is by-passed through the slot |44 so that the timing o! the start of uid deliveryi is advanced.'

st relatively high pump speeds. the sist iu is insumcient incapacity to by'pass any appreciable amount ortne nula displaced by the' piston sl,

and hence the start of fluid4 delivery will occur substantially when the recess |25A movesinto Stili another form of the inventionis illus',- trated in Figs. 12 to i5. In thlsformneach disfor injecchlrse conduit is adapted to receive iiuid un pressure from a plurality of thelpump cylinders. The cylinders may be connected in overlapping sequence so as to provide a graduated rate of fluid `delivery to the conduit. The characteristics of the pressure fluid delivery may be substantially adjustedand incidentally the ycapacity of the pump may be controlled by varying the timing of this sequence, the number of 'cylinders that will be connected, or the relative periods during which the cylinders are connected on occasion to each conduit. The graduated vcontrol "of the rate of pump delivery is particularly desirable incertain types of Diesel engines in which the r'ate of pressure rise in the engine cylinders iniiuences the operating characteristics of `the engine.

Referring more particularly to Figs. 12 to 16, the pump comprises a series of generally `cylindrical casing sections |45, |45, |41 and |45 assembled in end to end relation. The intermediate body section |45 is Aformed with an axial valve bore |45 in which a rotor 55 is slidably and rotatably disposed, and with a plurality of pump cylinders, four cylinders IBI, |52, |53 and |54 in the present instance, lcated in parallel uniformly peripherally spaced relation about the bore and in whicha plurality of pump pistons |55, |55, |51 and |55 are -respectively disposed for reciprocaf tion. The pistons |55 to |55 may be driven with harmonic motion in timed sequence, the phase relation of the rotor |55 to the pistons may be varied, and the axialposition of the rotor may be adjusted by means of the same construction as inv Figs. 1 to 5.

Opening respectively from the closed inner ends of the pump cylinders |5| to |54 to the bore |45 are a plurality of inlet and delivery ports |59, |55, |5| and |52. These ports are always within the range of a peripheral groove |63 formed in the rotor |55 and dening a low pressure uid area. A fluid supply-conduit |54 connected to parallel to the axis of rotation, and trailing edges and |51 inclined' to said axis. Formed respectively in the land areas |55 and |51 are two recesses or slots |55 and |55 extending generally longitudinally of therotor. Preferably, the recessesf|55 and '|55 also are triangular in form, with straight leading edges |55l and |55 parallel to the'edges |55* and |51*v and with inclined trailing edges |55h and |55 parallel to the edges |55 and |51. Hence, the point at which each recess will open to any one of the delivery ports will remain fixed while the point at'which cut-oilv will occur will vary upon axial adjustment of the rotor 55.

' The recesses |55 and |55 are connected par-*- allel to a branched delivery passage |15 formed within the rotor |55. Preferably, the |55 l c and |55 are so spaced and the rotor |55 is so timed to the pump' pistons that the leading recess |55v will open to' each delivery port during the initial portion of-the pressure stroke of mgm- 'elated pump piston so as to deliver a primary fluid charge to the e |15, and the trailing recess4 I55.will open' to another or the next dethe normal discharge pressure.

A this period and the composite pressure characn teristics thereoi are subject to variation by adjusting the rotor lll axially; At adjustment for minimum or small pump delivery, the recesses ill and Ill may -not communicate simultaneously with the respective delivery ports.

The leading faces oi the lands Ill `anni |81 in advance of the` recesses llland ill. and also the trailing :lace oi the land lll are of suiiicient width to cover each delivery port so as to prevent the port from by-passing iiuid there'across to the low pressure area III', and more particularly to prevent interruption oi the iluid delivery period.

As in the modined form oi Figs. to 10, stored pressure energy is built up in each pump cylinder just before communication oi the related delivery port with either oi the recesses l" and I so that iluid delivery will be initiated with a pressure impulse or wave. In the present instance, the leading lace oi'each of the land areas I" and |I1 is greater in widthl than each of the delivery ports lil to in. the leading face of either land area across any one of the delivery ports, 'the related pump cylinder will be sealed during a predetermined degree ci rotation oi the rotor III during which the iiuid in the cylinder will be compressed above The diilerence in width between each leading face and delivery port determines the degree oi pressure storage.

The delivery passage Ill opens to an elon` gated delivery recess or slot |1i which is formed in the periphery of the rotor lll and extends generally longitudinally thereof, and which is movable in allaxial positions of the rotor into successive commimication with a plmallty of uniformly spaced discharge ports |12, |18, Ill and |1l formed inthebody section i and opening to the bore III. The ports i12 to ill are connected respectively through passages I 1l11, l1l and |18 formed in the body section I to a plurality oi discharge conduits lll, lll, il! and |88 extending through and securedbyscrew' with parallel leading and trailing edges lli* and |1i" inclined to the atico! the rotation. It be evident that upon adjustment tor small loads, the trailing recess lllmay be cutfout'entirely from communication with the -recess.l1i and only the primary delivery vof iiuid throughthe recess III will occur. v

Y lach dischargeconduit immediately iiuid. and,rdue to the natural resiliency ot Iits walls, is stored with a substantial amountaote pressure energy.. In some instances, as tor Upon movement of.

afterv be- Y ing cut oi! at the rotor III, is lled with trapped jlapump ,osasso ample in i'uel injection systems where the discharge conduit has an outlet valve. it is desirable .to reduce the stored pressure energy in the conduit quickly to a 'point below the closing pressure oi-the valve so as to prevent dribbling' and produce a sharply deiined cutfoi'i oi injection. To this end, a narrow inclined bleed slot IIS is cut in the periphery of the rotor |50. The slot Illis parallel to and trails the recessvilli, and is so spaced therefrom that each of the discharge ports |12 to i1lupon leaving therecess will openv immediately thereto. Inter-communicating passages lll, lll and i", formed in the rotor itil, serrato-connect the slot |85 to the iiuid area Il! in all positions ot the rotor.

Preferably, a back pressure valve |89 is interposedbetween the area I tl and the slot ill to prevent the trapped pressure `energy in the discharge conduits fromV being dissipated below a predetermined point. 'Ihe valve Ill utilizes the passage |81 which extends axially of the rotor-ill and which is formed with an annular vvalve seatv i". A ball Ill is held against the 'seat Ill yieldably by a coiled-compression spring il! disposedin one end oi the passage I I81. The adjustable strength'ot 'the spring |92 determines the point to which the pressure in the discharge'.

conduits can bleed through thel s lot Ill'.

Briefly reviewing the operation, inFig. 16, the rotor ill has been adjusted vfor full throttle, the recess I1| is open to thedischarge port |12, and the recess III is about to open tothe delivery port Ill at which stored pressure energy is available. Assuming continued rotation of the roto; itl in the direction of the arrow, immediately upon movement oi the recess IIB over the port ill. a pressure wave will be released, opening the valve, if any, in the discharge conduit |80, and causing a primary now., Shortly thereafter, the delivery port il! is closed by the land area |61 to store up pressure energy in the .pump cylinder l". This occurs at a time when the piston is traveling on its pressure stroke through the zone oi maximum speed. Upon movementof the recess l over the port |82, a second pressure wave will `be released to institute the secondary or main iiuid delivery. The Vsecondary ilow is 'superimposed on the primary now during the remaining portion oi' the latter. The delivery connection with the conduit lill is interrupted when the recess |1| leaves the port |12. Immediately thereafter, the conduit Illl is vented to the bleed slot lll to reduce the trapped pressure therein. The foregoing operation is repeated in timed sequence. for thej series oi discharge ports I1! to i1l. v

Upon adjusting the rotor llt axially to reduce the quantity oi each discharge, the time of cutoil by the trailing edge lll isadvanced. For Y minimum delivery, the recess Ill will leave the port |12 before the recess ISI can establish secondarydelivcry.

- I claim as my invention: f

' i. A pump comprising, in combination, a plurality o! cylinder and piston units, each unit having a separatedischarge conduit,the piston'oi.' each unit having a stroke of constant length, and means including a rotary valve member operable in timed relation to said units i'or controlling the extent oi each piston displacement on Athe pres.- sure stroke eiiective in delivering uid to the associated discharge conduit. said valve member being axially the quantityr'oi in onbination. a piu- 7s' rality of cylinder and piston units operable in uniformly spaced phase relation, each unit having a separate discharge conduit associated therewith, the piston of ieach unit having a stroke of constant length, and means including a peripheral face rotary valve member driven in timed relation .to said units for controllingv the delivery in uniformly timed sequence lin metered quantities of uid from the cylinders of said units respectively to said' discharge conduits, said valve member being axially adjustable into different operative positions lto vary the quantity of fluid delivered during each delivery period..

3. A pump comprising, in combination, a'plu rality of parallel cylinder and piston units anknularly arranged in uniformly spaced relation,

each unit having a separate discharge conduit, the piston of each unit having a stroke of constant length, unitary drive means for operating said pump units consecutively in uniformly spaced phase relation, means including a rotary valve member located centrally of said units .for controlling thev delivery in uniformly timed sequence of fiuid inmetered quantities from the cylinders defining a cylinder, a piston reoiprocable in said cylinder, said piston having a stroke of constant length, said body defining a valve chamber and a port connecting said cylinder to said chamber, a discharge conduit, a. rotary valvemember in said chamber for effecting the delivery of fluid by displacement from said cylinder to said conduit over a predetermined portion of each pressure stroke of said piston, said valve member being adjustable intov different operative positions to vary the extent Aof said portion and being independehtiy adjustable to vary the phase relation of said portion to the entire stroke, andl means for rotating said valve member in timed relation to the reciprocation of said piston.

5. A pump comprising. in combination, a body defining a cylinder, apiston reciprocable -in said cylinder, said body defining a valve chamber and a portconne :ting said cylinder to said chamber,

a discharge conduit, a rotary valve member in said chamber for periodically interrupting communication between said chamber and said port to effect the delivery of fluid by displacement from said cylinder to said conduit over a predetermined portion of each pressure stroke of said piston, said valve member .being adjustable to varythe extent of said portion, and means for rotating said member in timed relation to the reciprocation of said piston.

6. A pump comprising, in combination, a bod defining a cylinder, a pistonk reciprocable in said cylinder, said body defining a valve chamber and a Aport connecting the closed endfof said cylinder 'to said chambena discharge conduit, means for cylinder to said conduit, andv means for driving said valve insuch timed phase relation to said piston that each period of fluid .delivery occurs while said piston is moving at substantially its v5 highest speed during an intermediate portion of its pressurestroke',.said` last mentioned means being adjustable to vary saidphase relation of r-member in said chamber driven in'timed relation to, said piston, said valve member being formed with a space defining a low pressure fluid area normally open to said port and with a land area predetermined .portion yof each pressure stroke of 4said piston to effect the delivery of a metered 'quantity of fiuidby piston displacement from said Vcylinder to said line.

8. A pump comprising, in combination, a body defining a cylinder, a piston extending reciprocably into said cylinder, said piston having a stroke of constant length, said body'deilning a cylindrical valve chamber parallel to said cylinder and a port connectingl the closed end of saidl cylinder to said chamber, a discharge line Yopening from the closed en d of said cylinder and including a one-way valve for preventing,r return` rotatable across said port to interrupt communication thereof with said fluid area only over a flow, and a rotary valvevv member in said -chamber and operable in tmedrelation to said piston, said valve member being formed inits peripheral surface with a space defining a low pressure fluid area normally open to said portand with a land area rotatable-across said port to interrupt communication thereof with said fluid area only over a predetermined portion of each pressure stroke of saidrpiston toefect the delivery of a metered quantity of fluid by piston displacement from said cylinder to said line, said valve member being axially adjustable to vary the extent 'of said portion. Y

9. A pump comprising, in combination, a body defining a cylinder, a piston reciprocable insaid cylinder, said body defining a valve chamber and a port connecting said cylinder to said chamber, a vdischarge line, and a rotary valve memberl in said chamber and operable in timed relation to said piston, said valve member having a space deflning a low pressure fluid supply and relief area movable into communication with said port and having a land varea rotatable across said port during a portion of each pressure stroke of said piston to interrupt communication between said port and said uid area to eiect the delivery of fluid from said cylinder to said line.

10. A pumpl comprising, in combination, a body formed with a pump cylinder closed at one end and with a -bore constituting an inletv chamber parallel to said cylinder, the. closed end of said cylinder havingan inlet port opening from said chamber and having a delivery port, a discharge line connected to said delivery port, a spring seated non-return valve interposed between said delivery port and said line, a pump piston slidably disposed in said cylinder,drive means for reciprocating said piston with an harmonic motion, a rotor slidably and rotatably disposed in said chamber, said rotor having an annular low pressure fluid area in its periphery normally in communication with said inlet port and having a raised lland (area projecting into said fluid-area for Vriitary movement across said inlet port to close said inlet port against communication with said iluid area.. a supply inlet opening to said fluid area, means `connected to saiddrive means for rocation of said pistonwith said landarea mov- `ablel across said inlet port during an intermediate vlfxyirtion of each pressure stroke of said piston, 'said land area varyingV in width longitudinallyof said rotor. and means for adjusting said rotor axially.

l11. lA pump comprising, in combination, abody formed witha pump cylinder closed at one end' and with a 'bore constitutingv an inlet chamber parallel to said cylinder, the closed end of said cylinder having an inlet port opening from said "against communication with said iluid area, a"

chamber and having a delivery port, a discharge line connectedl to said delivery port,I a spring seated non-return valve in said line, a pump piston slidably disposed in said cylinder, drive means for reciprocating said piston, a rotor slidably and rotatably disposed in said chamber, said rotor having an annular lowvpressure fluid area in its periphery normally in communication with said inlet port and having a raised land area projecting into said fluid area for rotary movement acrossA said inlet port to close said inlet port supply inlet opening to said fluid area, and means connected to said drive means for rotating'said rotor in timed relation to the reciprocation of said piston with said land area movable across said inlet port during each pressure stroke of said piston.

' 12.` A pump comprising, in combination, a body having a plurality of parallel pump cylinders arranged annularly and in uniformly spaced relation, a central valve chamber, and a plurality of ment successively across said ports, and means for driving said member in timed relation to said i pistons to move said landarea over each of said inlet ports to close same during a portion only of' the pressure period in the associated cylinder.

13'. A pump comprising. in. combination.' a piston and cylinder unit having uid inlet and discharge means, drive means including a shaft for reciprocating the piston, a rotary valve member for controlling saidilrst mentioned means, said shaft and said member being axially alined and being formed in their adjacent ends respectively with two opposed axial bores, said memberbeing formed with two diametrically opposed longiv tudinal slotsopeningto opposite sides `of its bore. said shaft being formed withan 'inclined slot opening to one side of its bore, an intermediate shaft extending slidably at its oppomte ends respectively into said bores. and having keys ex tending slidably into said slots. and rack and gearmeans for adjusting saidintermediate shaft axially whereby the drive phase relation between said pistonland 'said valve member may be ad- `14. A pump comprising. in-'combinati0n. a piston and cylinder unit having'fiuid inlet'snd discharge means, means including a drive shaft for thepiston. a rotary valve member' for controlling said ih -st mentioned means. said actas-1o .rotating said rotor in umedr'eiaaon to the recipshaft and said member being axially alined"I an intermediate shaft telescoping at its opposite ends respectively with said member and said drive-shaft, said intermediate shaft having an' axial spline connection with said valve member `mediate shaft axially whereby the drive .phase relation between said piston and said member may be adjusted.

15. A pump comprising. in combination, s; pis-v ton' and cylinder unit having uid inlet and dis- Vcharge means, drive means including a shaft for' reciprocating the-piston, a rotary valve member axially aligned with said shaft for controlling said first mentioned means, and means connecting said shaft to said member for rotating the-latter E in timed relation to the reciprocation of said piston, said last mentioned means being viisliustable to vary the drive phase relation between said piston and said valve member.

16. A pump comprising, in combination, a body section having a borev opening therethrough and having a plurality of parallel pump cylinders .spaced uniformly about'said bore. a plurality of pistons one reciprocable in eachcylinder, means for driving said pistons in timed sequence. fluid inlet and discharge means for said cylinders, a cylindrical valve member for controlling said last mentioned means, said valve member extending slidably and rotatably through said bore, means 'operatively connected to one end of said member for adjusting said member axially, and means axially splined to the other en d of said member for rotating said member in timed relation to the reciprocation ofsaid piston. y c

17. A pump comprising, in combination, a body formed. with a pump cylinder,'a delivery -.port opening from said cylinder, and a discharge port spaced from said delivery portland said cylinder, a piston reciprocable in said cylinder. and a rotary valve driven in timed relation to said piston for connecting said delivery port to said -discharge port during a predetermined vportion of each pressure stroke of said piston, said valve being adjustable to vary the extent of said portion. l

18. A pump comprising, in combination, a body lformed with a pump cylinder. a delivery port opening from said cylinder, and a discharge port spaced from said delivery port, a piston reciprocable in said cylinder, means for driving said piston with an harmonic motion, and a rotary valve driven in timed relation to said piston for connecting said delivery port to said discharge port during an intermediate portion of each pressure stroke of said piston, said valve being adjustable to vary the phase relation of said portion to said entire stroke. 4 v v 19. A pump comprising, in combination, a body formed with `a pump cylinder, a uid supply, a delivery and inlet port opening from said cylin- Ider, and a discharge port spaced fromsaid delivery port and said cylinder. a piston reciprocable in said cylinder, and a rotary metering valve member driven in timed relation to said piston,

said member having two spaced interconnected -tioned port to said fluid supply during the re.

mainingpartofeachprelcurestrokeandduring 20. A pump comprising, in combination, a body formed with a pump cylinder, `a delivery port opening from said cylinder, and a discharge port spaced from said delivery port, a piston reciprocable in said cylinder, and a rotary valve member driven in timed relation to said piston, said member 4having two spaced interconnected-.recesses movable successively into overlapping periods lof communication respectively with said ports during each pressure stroke of said pistons,

whereby initially stored pressure energy is created in said cylinder and then the delivery of v a metered quantity of fluid initiated with `a pressure Wave is effected. r

21. A pump comprising, in combination, a body formed with a pump cylinder, a delivery port opening from said cylinder, and a discharge port spaced from said delivery port, a piston reciprocable in said cylinder, and a rotary valve member driven in timed relation to said piston, said member having two spaced recesses movable respectively and for overlapping periods into communication with said'ports once during each pressure stroke of said piston, and having a passage connecting said recesses', and a non-return valve interposed in said passage between said recesses.

22. A pump comprising, in combination, a body formed withl a pump cylinder, a delivery port opening from said cylinder, and a discharge port spaced from said' delivery por-t, a piston reciprocable in said cylinder, and a cylindrical rotary valve member driven in timed relation to said piston, said member having two elongatfl generally longitudinal interconnected recesses movable respectively across said ports for simultaneous communication therewith over a predetermined portion of each pressure stroke of said piston, said recesses having controlling edges relatively inclined longitudinally of said member for adjusting the extent of saidportion upon axial adjustment of said rotor.

23. A pump comprising, in combination, a body formed with a pump cylinder and a delivery port opening from said cylinder, a piston reciprocable in said cylinder, and a rotary valve member driven in timed relation to said piston, said valve .member defining a low pressure uid area normally open to said delivery port, and a raised land area projecting into'the zone of said fluid area for movement across said delivery port .to

interrupt communication thereof with said fluid area over a predetermined portion of each pressure stroke of said piston, and a'recess formed in said land area for movement across said delivery port to receive a metered quantity of iiuid there-- land area projecting into the zone of said fluid.

area for movement across said delivery port to interrupt communication thereof with said iluid area over a portion of each pressure stroke of said piston, an elongated recess formed in said land area for movement across said delivery port to receive a metered quantity of iluid therefrom, said recess having a side edge inclined to the axis of said member, and means for adjusting said member axially.

25. A pump comprising, in combination, a body formed with a pump cylinder and a delivery port opening from said cylinder, a piston reciprocable in said cylinder, and a cylindrical axially ad- `,instable rotary valve member driven in timed removement across said delivery port to receive a quantity of fluid therefrom, a discharge port in said body, a second kelongated recess connected to said rst mentioned recess and formed in the periphery of said valve member for movement across saidvdischarge port, said second recess having a leading edge parallel to the axis of rotation and movable over said discharge port to institute the period of iluid delivery after said first mentioned recess has established communication With said delivery port, said iirst mentioned recess having a trailing edge inclined to said-axis and mov/able from said delivery port to terminate said period before said second recess has left said discharge port, and means for adjusting said valve member axially to vary the duration of said period.

26. A pump comprising, in combination, a body formed with a pump cylinder, a delivery port opening from said cylinder, and a. discharge port, a piston reciprocable in said cylinder, and a rotary valve member driven in timed relation to said piston, said valve member defining a low pressure fluid .area normally open to said delivery port, and aV raised land area projecting into the zone of said fluid area for movement across said delivery port to interrupt communication thereof with said fluid area over a predetermined portion of each pressure stroke of said piston, an elongated recess formed in said valve member for movement across said discharge port, a second elongated recess formed in said land area for movement across said delivery port to receive a metered quantity of fuel therefrom, said second recess having a leading edge parallel to the axis of said rotor and defining a leading face on said land, said leading face being greater in width than said delivery port to seal said cylinder, said leading edge being movable onto said delivery port to institute the period of iiuid deliveryv after communication of said rst mentioned recess with said discharge port is established, said ilrst mentioned recess having a trailing edge inclined to said axis and movablefrom said discharge port to terminate said period while said second recess is open to said delivery port, and means for adjusting said valve member axially.

27, A pump comprising, in combination, a body formed with a. pump cylinder, a delivery port .opening from said cylinder, and a discharge port spaced from said delivery port, a piston reciprovcable in` said cylinder, and acylindrical axiallyv adjustable rotary valve member driven in timed relation to said piston, said valve member defining a low pressure peripheral iiuid area normally open to said delivery port, and a raisedland area projecting into the zone of said duid-area for movement across said delivery port to interrupt communication thereof with said iluid area over a predetermined-portion. of each pressure stroke of said piston, an elongated recess formed in said land area for movement acrosssaid delivery port to receive a metered quantity of fuel therefrom,

recess and movable across said discharge port,

munication and the other of said recesses having a trailing edge inclined to said axis for ending said communication, and means for adjustingv said valve member axially.

28. A pump comprising, in combination, a b formed with a pump cylinder, a delivery port opening from said cylinder, and .a discharge port spaced from said delivery port, a piston reciprocable in said cylinder, and a cylindrical axially adjustable rotary valve member driven in timed relation to said piston, said valve lmember deining a low pressure peripheral fluid area normally open to said delivery port, and a raised land area projecting into the zone o! said uid area f or movement across said delivery. port to interrupt communication thereof with said iiuid area over a predetermined portion of each pressure stroke of said piston, an elongated recess formed in said land area for movement across said delivery port to receive a metered quantity o1' fuel therefrom, said valve member being formed in its periphery with a recess connected to said ilrst mentioned said'recesses being spaced to communicate simultaneously for a predetermined portion of said pressure stroke respectively with said ports, one of said recesses having a leading edge parallel to the axis of rotation ior initiating said communication and the other of said recesses having a trailing edge inclined to said axis for ending said communication, said valve member being formed with a recess trailing said second mentioned recess by a distance substantially equal to the width of said discharge port and with a passage connecting said last mentioned recess tosaid fluid area, a back pressure valve interposedin said passage, and means for adjusting said valve member axially to vary the extent of said last mentioned portion.

29. A pump comprising, in combination, a body formed with a pump cylinder, a delivery port opening from said cylinder, and a discharge port spaced from said delivery port and said cylinder,

' a piston reciprocable in said cylinder, and a rotary metering valve member driven Vin timed relation to said piston, said valve member having a ow passage movable into position to connect said ports once during only an intermediate predetermined part of each pressure stroke oi' said piston. l

30. A pump comprising, in combination, a body formed` with a pump cylinder, a delivery port opening from said cylinder', and a dis.- charge port spaced from said delivery port, a piston reciprocable in said cylinder, a rotary valve member driven in timed relation to said piston, said member having a now passage movable into position to connect said ports for a predetermined portion of the pressure stroke of said piston once-during each preure stroke, and 'means for venting said. discharge port to a lower pressure immediately after said period. 31'. A pump comprising, in combination, abody formed with a pump cylinder, la delivery port opening from said cylinder.' and a discharge port spaced from said delivery port, a piston recipro-` ber rotatable in timed relation to the movement otsaid piston. said member having a low pressure uid area. a passage for connecting said ports for a predetermined portion Aof the pressure stroke o! 'said piston once during each pressure stroke, a recess movable into communication with said discharge port immediately after said portion, and a passage connecting said recess to-said area, anda back pressure valve in said lastmentioned passage, said delivery port being adapted for communication with said area during substantially the entire time that the delivery port is not open to said first mentioned passage. j

32. A pump comprising, in combination, a plurality of pump cylinders. a plurality oi pistons one reciprocable .in each` cylinder, means forv driving said .pistons in timed sequence.. a plurality o! sets ofportsone set for each cylinder and comprising a delivery port opening from said cylinder anda discharge port' spaced from said cylinder, and a rotary metering valve driven in timed phase relation to said pistons and having a ilow passage movable` successively into coacting relation with said setsof ports and in each instance connecting the ports of one set for the delivery of a metered quantity oi' uid during a partonly of the pressure stroke of the related piston.

33. A pump comprising, in combination, a plurality of parallellannularly arranged pump cylinders, a plurality of pistons one reciprocable in each cylinder, means for driving said pistons in timed sequence, a central valve chamber, a plurality of delivery ports opening in a common transverse plane respectively trom said cylinders to said chamber, a plurality oi discharge ports opening directly from said chamber and paired respectively with said delivery ports, a. rotary metering valve member in said chamber,.and means for driving said member in timed relation to said pistons, said member having a vflow passage movable to connect the ports of each of said pairs once during one part only of each pressure stroke of the related piston, and having a relief area movable into communication with each ie livery port during substantially the remaining part of each pressure stroke.

Vcylinders to said chamber, a plurality of discharge ports opening from lsaid chamber and paired respectively with said delivery ports, a

cylindrical rotary valve member in said chamber,

and means for driving said member in timed relation to said pistons, said member having a. ilow passage movable to connect the ports oi each of said pairs once during each pressure stroke 'of the related piston, said passage terminating at its ends in two spaced elongated recesses in the periphery oi' said member, said recesses having controlling edges relatively inclined to each other longitudinally of said member. and means for adjusting said member axially to vary the relative phase relations of said controlling edges respectively to said ports.

35. A pump comprising. in combination, a body formed with a plurality of parallel annularly arranged cylinders,'a`central valve chamber, a plurality of delivery portsopening respecmember mounted in said chamber, means for 10- v tating said valve member in timed relation tothe reciprocation of said pistons, said valve member having a peripheral space deilning an annular low pressure iluld area extending through said first mentioned plane for communication with said delivery ports, two raised land areas on said member projecting in spaced relation into said iiuid area. through the zone of said delivery ports, two recesses formed respectively in said land areas, said recesses being spaced apart to move successively into respective communication with two delivery ports of any one of a plurality of sets of said delivery ports, and a. third recess formed in said valve member for movement successively across said discharge ports and in intercommunication with said first mentioned recessesysaid third recess being related in phase to said ilrst mentioned recesses to communicate with'each discharge port during communication of said first mentioned recesses singly or` jointly with the two reated `delivery ports.

36. A pump comprising, in combination, a body formed with a plurality of parallel annularly arranged cylinders, an axial valve bore, a plurality of delivery ports opening respectively from said cylinders in a common transverse pla-ne to said bore, and a plurality of discharge ports one for each cylinder opening in another common transverse plane from said bore, a plurality of pistons. respectively reciprocable in said cylinders, means for driving said pistons in timed sequence, a cylindrical valve member rotatably and slidably mounted in said bore, means for rotating said valve member in timed relation to the reciprocationv of said pistons, said valve member having a peripheral space defining an annular low pressure fluid area extending through said r'st mentioned pane for communication with said delivery ports, two raised land areas on said member projecting in spaced relation into said iluid area through the zone of said delivery ports, two recesses formed respectively in said land areas, said recesses being spaced apart 'slightly' more than the distance between any tw'o adjacent delivery ports, each recess having a leading edge parallel tothe axis of rotation, a third recess formed in said valve member for movement successively across said discharge ports and in intercommunication with said first mentioned recesses,

said third recess being related in phase to said ilrst mentioned recesses to communicate with each discharge port during communication of said first mentioned recesses singly or'jointy with two related delivery ports, said last mentioned Y -recess having a trailing edge inclined to said axis,

and means for adjusting said rotor axially.

37. A pump comprising, in combination, a body formed with a plurality of parallel annularlyarranged cylinders, a central valve chamber. a plurality of delivery ports opening respectively from said cylinders to said chamber, and a plurality of discharge ports one for each cylinder opening from said chamber, a plurality of pistons respectively reciprocable in said cylinders, means for driving said pistons in timed sequence, a rotary valve member mounted in said chamber, and means for driving said valve member in timed relation to the reciprocation of said pistons. said valve member having means for periodically connecting each discharge port over predetermined portions of the pressure delivery strokes of the respective pistons in overlapping sequence to a plurality of said delivery'ports for the supply of a metered quantity of iluid at a graduated rate of ilow.

38. A pump comprising, in combination, a plu- -rality of pump cylinders, each cylinder having a delivery port, a plurality of pistons respectively reciprocable in said cylinders, means for driving said pistons in uniformly timed sequence, a plurality of discharge lines one for each cylinder, and

'means operable in timed relation to said pistons for delivering metered quantities of fluid under pressure from said cylinders in uniformly timed sequence to said discharge lines, said means being operable to connect a plurality o! said ports to each of said lines during each period of iluid delivery.

39. A pump comprising, in combination, aplurality of pump units, each unit comprising a cylinder having a delivery port, and a piston reciprocable in said cylinder, means for driving the pistons, a discharge passage, and means for connecting said ports in progressively increasing number during the pressure strokes of 'said'pistons to said passage to deliver a metered quan'- tity of iluid at a graduated rate to said passage once during each pump cycle.

40. A pump comprisingin combination, a plurality of pump cylinders, each cylinder having a. delivery port, a .plurality of pistons respectively reciprocable in said cylinders, means for driving said pistons, a. discharge line, and means including a rotary valve member operable in timed relation to said pistons for periodically connecting said ports simultaneously to said discharge line during the pressure strokes of said pistons to periodically deliver a metered quantity of fluid' to said discharge line.

41. A pump comprising, in combination, a plurality oi' pump cylinders, each cylinder having a V vdelivery port, a plurality of pistons respectively v reciprocable in said cylinders, means for driving lbeing adjustable to vary the amount of said metered vquantity of iluid. .e

42. A metering and distributing pump comprising, in combination, a body having a plurality of parallel pump cylinders arranged annularly and in uniformly spaced relation, a central valve chamber about which said cylinders are spaced, a plurality of delivery ports opening respectively from the pressure ends of said cylinders, a plurality of inlet ports opening from the periphery of said chamber respectively to said endsof said cylinders, a plurality of pistons respectively mounted in said cylinders, means for driving said pistons in timed sequence, avalve member rotatably mounted in said chamber for controlling said inlet ports, means for' driving said valve member in timedrelation to said pistons, said valve member having a land area movable successively across said inlet ports to close each inlet port during a predetermined portion of the pressure stroke of the associated piston to cause port, and having a fluid supply area movable into communication withsuccessive inlet ports and establishing intercommunication between all of said inlet ports not closed by said land area.

43, -A metering and distributing pump comprisy sure peripheral uid area normally open to said inlet ports and establishing intercommunication therebetween and with a l'and area projecting into said fluid area for movement successively and individually across said ports to interrupt communication thereof with said fluid area over a predetermined portion of each pressure stroke oi' the associated piston and to effect the delivery in uniformly timed sequence of metered quantities of fluid from said cylinders respectively to said lines, means for driving saidA valve member in timed relation to the reciprocatlon of said pistons, said land area varying in Awidth along said valve member, means for adjusting said valve member axially, and means for adjusting the timed phase relation between said pistons and said valve member.

i v 44. A metering and distributing pump compris- :ing, in combination, a body having a bore and a 4plurality of parallel pump cylinders arranged annularly and in uniformly spaced relation about 40 said bore, a plurality of ports opening from the periphery ofV said bore respectively to the disv charge ends of said cylinders, a plurality of separate discharge lines one for each cylinder, a plurality of pistons respectively reciprocable in said cylinders, means including a shaft for driving said pistons with an harmonic motion in uniformly timed sequence, a rotary valve member operatively mounted in said bore in axial lalignment with said shaft. said valve member being formed with a low pressure 'peripheral iluid area normally open to said inlet ports and establishing intercominunication therebetween and with a land area y roiecting into said duid area for movement sucssively and individually across said ports to intierrupt communication thereof with 'said fluid 1 A"area over a predetermined portion of each pressure stroke o vthe delivery ln ormly timed sequence of mee associated piston and to effect tired quantities of fluid fromA said cylinders'respectively to said lines, said land area varying in width along said valve member, means including an axially adjustable spline connection between said shaft and said valve member fordrivlngsaid valve member in timedA relation to the reciproca.-

tion of said pistons, and means for adjusting said valve member axially.

A5. A pump comprising, in combination.' a plu-A rality of pump units each having a cylinder with an inlet port and with an individual discharge line and alpiston reciprocable in said cylinder, means for reciprocating the pistons ini timed sequence,

slowpressurenuidsourcenormallyindireetv communication with the inlet ports, and means fluid to be delivered to the associated deliveryl means and-including a single valve member com-h lines respectively connected directly to said cylinders, a plurality-of pistons respectively reciprocable in said cylinders, means for driving said plstons in uniformly'timed sequence, a rotary valve member operatively mounted in said chamber and having a land area movable successively 'across said ports and timed to seal `each port during a predetermined portion of the pressure stroke of the associated piston to effect the discharge of ilui'd to the associated line, and having a low pressure peripheral area for venting and establishing intercommunication between the cylinders of which said ports are not closed by said land area.

47. A pump comprising, in combination, a plurality of pumping units each having a cylinder and piston reclprocable therein, means for driv-` ing said pistons in timed sequence, a plurality of separate discharge lines one for each cylinder, each cylinder having two ports of which one is a pressure discharge port opening to the associated discharge line and the other is a suction and pressure relief port for admitting fluid during each suction stroke of the associated piston, a low pressure iiuid supply chamber normally in f communication with the suction and relief 'ports of said units, a rotary valve member in said chamber for controlling said suction and relief ports, and means for operating said valve member in timed relation to said pistons, said valve member having a land area movable successively over said suction and relief ports to close eachb during a predetermined portion of the pressure stroke ofthe associated piston, and being recessed to relieve each of said suction and relief ports to l said chamberat all other times.

ber in said chamber for controlling said ports,

and means for'operating said valve member in timed relation to said pistons, said valve member being recessed to define with said chamber a low pressure huid area normally open to eachvof said ports, a raised land area projecting into the zone of said fluid area for movement successively.

across said portato' interrupt communication of each of said ports with said fluid area during a portion of the pressure stroke of the associated piston, each port at all other times relieving to' said fluid area, and a discharge passage having an inlet 1 port in the face oi'` said land area for movement successively into communication with said first mentionedports whencovered by saidland area to receive the fluid displaced by each piston during said portion jof the premure stroke.-

A49. A pump comprising, in combination, a plurality of pump units each having acylinder and Il opcl'ablointimedrelationtosaidfirstmentioned .apistonreciprocablcthcrcmmcans for driving 7c accuse v 13 said pistons in timed sequence, each oi said cyla flow passage movable to connect said ports sucinders having a delivery port, a plurality o! discessively to their respective discharge passages. charge passages respectively for said units and the connection in each instance being established spaced from the associated cylinders and the deonly during an intermediate predetermined part 5 livery ports, and a rotary metering valve member of each pressure stroke of the associated piston. 5

driven in timed relation to said pistons and having CARROLL R. ALDEN.

CERTIFICATE 0F CORRECTIDN.

Patent No. 2,052,549. l l

CARROLL R. ALBEN.

It is hereby certified that error appears in the printed Vspecification of the above numbered patent requiring correction as follows: Page '7, second .y column, `line 50, claim 9, for the Word "movable" read rotatable; and line =5l sameY claim, for "rotatable" read movable; page lO,v second column, line 50,' claim 34, for "angularly" read annularly; page 1l, second column,y line 50-5l, clam,Y 41, .strike lout "in suooesso'n"'; and that the said Letters lPaten-t 'should be read with these corrections therein that the same may conform to the.

' record of the case in the Patent Uffice; y

(Seal) Y i Signed and sealed this 17th day of November', Av. D. 1936.

Henry Van Arsdale Acting Commissioner or Patents,

4September' l, 1936.

accuse v 13 said pistons in timed sequence, each oi said cyla flow passage movable to connect said ports sucinders having a delivery port, a plurality o! discessively to their respective discharge passages. charge passages respectively for said units and the connection in each instance being established spaced from the associated cylinders and the deonly during an intermediate predetermined part 5 livery ports, and a rotary metering valve member of each pressure stroke of the associated piston. 5

driven in timed relation to said pistons and having CARROLL R. ALDEN.

CERTIFICATE 0F CORRECTIDN.

Patent No. 2,052,549. l l

CARROLL R. ALBEN.

It is hereby certified that error appears in the printed Vspecification of the above numbered patent requiring correction as follows: Page '7, second .y column, `line 50, claim 9, for the Word "movable" read rotatable; and line =5l sameY claim, for "rotatable" read movable; page lO,v second column, line 50,' claim 34, for "angularly" read annularly; page 1l, second column,y line 50-5l, clam,Y 41, .strike lout "in suooesso'n"'; and that the said Letters lPaten-t 'should be read with these corrections therein that the same may conform to the.

' record of the case in the Patent Uffice; y

(Seal) Y i Signed and sealed this 17th day of November', Av. D. 1936.

Henry Van Arsdale Acting Commissioner or Patents,

4September' l, 1936. 

